This symbol of Berlin, erected in the ’60s, is not only a tourist magnet and a great way to get your bearings, but also the perfect place to meet, eat, and celebrate—just as long as you don’t mind your feet not touching the ground. In its silver sphere you’ll find a restaurant slowly rotating about its own axis, and a bar with a far-reaching view. But once inside you won’t see that the sun’s reflection on the sphere forms a Christian cross: an unforeseen phenomenon that gave the GDR government, who wanted the tower to show the strength and advances of their republic, more than one sleepless night.